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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Beginning balance | $ 55,197,000 | $ 46,737,000
Percentage payments on collections of net sales of DepoBupivacaine products, including EXPAREL | 6,843,000 | 8,460,000
Ending balance | 62,040,000 | $ 55,197,000
Upon first commercial sale in the United States |  |
Goodwill |  |
Milestone payments for EXPAREL agreed in connection with acquisition | 10,000,000 |
Upon first commercial sale in a major EU country (United Kingdom, France, Germany, Italy and Spain) |  |
Goodwill |  |
Milestone payments for EXPAREL agreed in connection with acquisition | 4,000,000 |
When annual net sales collected reach $100.0 million |  |
Goodwill |  |
Milestone payments for EXPAREL agreed in connection with acquisition | 8,000,000 |
Annual net sales threshold | 100,000,000 |
When annual net sales collected reach $250.0 million |  |
Goodwill |  |
Milestone payments for EXPAREL agreed in connection with acquisition | 8,000,000 |
Annual net sales threshold | 250,000,000 |
When annual net sales collected reach $500.0 million |  |
Goodwill |  |
Milestone payments for EXPAREL agreed in connection with acquisition | 32,000,000 |
Annual net sales threshold | 500,000,000 |
Skye Pharma Holding Inc. [Member] |  |
Goodwill [Roll Forward] |  |
Total Milestone Payments Yet to be Paid for Sale of Product in Connection with Acquisition | $ 36,000,000 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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